Strainer bag attachment arrangement



Sept. 2, 1969 A. c. WROTNOWSKl ETAL 3,464,561

STRAINER BAG ATTACHMENT ARRANGEMENT Filed Nov. 15, 1966 W m 50 swfi m NRA R EW0 0 V .R f T N T United States Patent Ofice 3,464,561 STRAINER BAG ATTACHMENT ARRANGEMENT Arthur C. Wrotnowski, Greenwich, and Edward A. Smith, Glenville, Conn., assignors to American Felt Company, Glenville, Conn, a corporation of Massachusetts Filed Nov. 15, 1966, Ser. No. 599,661 Int. Cl. B01d 35/02 US. Cl. 210232 2 Claims ABSTRACT OF THE DISCLOSURE A fluid strainer bag assembly including a bag holding plate and having a hemmed open ended strainer bag with a flexible hoop within the hem for engaging with the plate and suspending the bag therefrom.

This invention relates to strainer bags having an open end which are removably suspended on the ledge of a holding plate.

In the prior art, strainer bags have been tied onto the fluid supply pipes or have been fastened or connected thereto in various manners. These have been cumbersome and unreliable. Also, valuable straining area has been used in fastening to the pipe due to bunching thereof and other reasons, such reducing the efliciency of the strainer. Strainers must be removed for cleaning or replacement and when the slurry is dirty, the removal process has been messy. In short cycle operation the labor cost becomes objectionable.

One of the objects of the invention is to provide a simple holding means for a strainer bag.

Another of the objects of the invention is to provide an attachment arrangement for removably holding a strainer bag.

In one aspect of the invention, the strainer bag is made of one piece of man-made fiber felt although other materials may be used. The felt also may have a woven insert as shown in the patent to Gates No. 2,588,288. The open end of the bag has a hem placed therein surrounding and holding a flexible hoop. The holding plate for the bag comprises a dish or suitably shaped plate with an outwardly extending annular flange or ledge around the lower open end thereof. The plate may have a combination holding and inlet conduit for feeding slurry to the interior of the holder and bag. The bag may be placed in position by deforming the upper edge hoop as it is slipped over the flange and around the outside of the plate. It then can be pulled down so that it sealingly engages the plate and the flange from which the bag is suspended.

These and other features, objects and advantages of the invention will become apparent from the following description and drawings which are merely exemplary.

In the drawings:

FIG. 1 is an elevational view partly in section;

FIG. 2 is a reduced size top view of FIG. 1; and

FIG. 3 is a fragmentary schematic view of one manner of assembling the invention.

Referring to FIG. 1, holding plate may be dishshaped as shown with an aperture 11 screw threadedly receiving slurry inlet conduit 12. The conduit can serve to support the assembly or a separate (not shown) support means can be employed.

Plate 10 has an annular or suitably shaped flange or ledge 13 surrounding the lower open mouth 14 of plate 10. The plate 10 may be of metal or plastic.

Strainer bag 15 preferably is made of felt and of synthetic or man-made fiber. The felt can be mechanically interlocked by needling. The fiber sizes can be chosen in 3,464,561 Patented Sept. 2, 1969 the manner described in copending application Ser. No. 637,310, filed Nov. 2, 1966. A series of bags of calibrated strainer media of felt can be made up which can separate or classify particles, effective in the 5 to 200 micron range. Such have a long cycle due to depthwise straining and they will not blind or become irrelievably clogged with dirt. They can be washed to the point of regaining original flow rate which is not true of woven textiles. The felt strainer is characterized by low pressure drop and high flow rate at given particle size ratings.

In the form shown in FIG. 1, the bag 15 is made of a single piece of felt and has a vertical overlapped seam 16 and an angled curved bottom seam 17 as described in detail in copending application Ser. No. 594,619, filed Nov. 15, 1966, such producing a bag of optimum strength and pouring characteristics.

Hem 18 is formed at the top or open end of the bag, flexible hoop 19 being sewn therein. The hoop 19 is of flat strip of a suitable material such as stainless steel or a polymerized formaldehyde.

In assembling the bag 15 to plate 10, it is tilted as shown at A in FIG. 3 and the hoop deformed or flexed so that it will slide over flange 13. The bag then can be drawn upwardly to position B, arrow 20', and then drawn downwardly as shown by arrow 21 until the hem and upper end of the bag sealingly engage the plate 10'. Removal of the bag is made in the reverse order.

The invention is especially adapted for installations where paint, fruit juice, oil, wax, etc. are to be strained. It provides a simple assembling and removal system for the straining cycles. No mechanical locking means are needed and it has been found that it is reliable. It is much more economical than canister type filter systems because there is an increased surface area and a greater effective depth straining. Also, where the bag can be cleaned or reused, it is a simple matter to put a clean bag in place and then wash the used bag.

What is claimed is:

1. In a fluid strainer bag assembly, the combination including an inverted dish-shaped bag holding plate having means to feed fluid to be strained thereto and an outwardly extending annular ledge around the bottom edge thereof, means to support said plate, a felt strainer bag means removably supported by said ledge having a hem around the open end thereof, and a circular flexible hoop means within said hem of a lesser interior diameter than the exterior diameter of said ledge whereby said hoop means and hem are adapted to be flexed and distorted for assembly from the underside over and positioning above said ledge and said hem will snugly engage said ledge when reflexing to its circular shape, and said bag means can be removably suspended on said ledge in fluid receiving relation to said holding plate for straining fluid fed thereinto.

2. A strainer bag assembly according to claim 1 wherein the flexible hoop means is of flat strip material and is dimensioned so that it will tightly hold the hem portion to the outside of the dish-shaped plate.

References Cited UNITED STATES PATENTS 150,525 4/1874 Carpenter 210460 339,722 4/1886 Wiles 210-460 2,116,044 5/1938 Rucker 210482 REUBEN FRIEDMAN, Primary Examiner T. A. GRANGER, Assistant Examiner US. Cl. X.R. 210-45 9 ULlllJl-J ULIllJJU lnlLuJL Ul'l'lbl;

5/ 9) 6 CERTIFICATE OF CORRECTION Patent No. 3,u6u,561 D te Sebtember 2. 1989 Invencor(s) Arthur C. Wrotnowski and Edward A. Smith It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

I Column 1, line a2, "2,588,288" shoula be "2,588,228:

SIGNED AND SEALED mics-m9 Attest:

I." Edward M. Fletcher, It.

WILLIAM E. SOHUYLER, JR. All-h1g0 Oommiulonlr of Patent. 

